The current racy approach is to enable asynchronous cancellation
before making the syscall and restore the previous cancellation
type once the syscall returns, and check if cancellation has happen
during the cancellation entrypoint.
As described in BZ#12683, this approach shows 2 problems:
1. Cancellation can act after the syscall has returned from the
kernel, but before userspace saves the return value. It might
result in a resource leak if the syscall allocated a resource or a
side effect (partial read/write), and there is no way to program
handle it with cancellation handlers.
2. If a signal is handled while the thread is blocked at a cancellable
syscall, the entire signal handler runs with asynchronous
cancellation enabled. This can lead to issues if the signal
handler call functions which are async-signal-safe but not
async-cancel-safe.
For the cancellation to work correctly, there are 5 points at which the
cancellation signal could arrive:
[ ... )[ ... )[ syscall ]( ...
1 2 3 4 5
1. Before initial testcancel, e.g. [*... testcancel)
2. Between testcancel and syscall start, e.g. [testcancel...syscall start)
3. While syscall is blocked and no side effects have yet taken
place, e.g. [ syscall ]
4. Same as 3 but with side-effects having occurred (e.g. a partial
read or write).
5. After syscall end e.g. (syscall end...*]
And libc wants to act on cancellation in cases 1, 2, and 3 but not
in cases 4 or 5. For the 4 and 5 cases, the cancellation will eventually
happen in the next cancellable entrypoint without any further external
event.
The proposed solution for each case is:
1. Do a conditional branch based on whether the thread has received
a cancellation request;
2. It can be caught by the signal handler determining that the saved
program counter (from the ucontext_t) is in some address range
beginning just before the "testcancel" and ending with the
syscall instruction.
3. SIGCANCEL can be caught by the signal handler and determine that
the saved program counter (from the ucontext_t) is in the address
range beginning just before "testcancel" and ending with the first
uninterruptable (via a signal) syscall instruction that enters the
kernel.
4. In this case, except for certain syscalls that ALWAYS fail with
EINTR even for non-interrupting signals, the kernel will reset
the program counter to point at the syscall instruction during
signal handling, so that the syscall is restarted when the signal
handler returns. So, from the signal handler's standpoint, this
looks the same as case 2, and thus it's taken care of.
5. For syscalls with side-effects, the kernel cannot restart the
syscall; when it's interrupted by a signal, the kernel must cause
the syscall to return with whatever partial result is obtained
(e.g. partial read or write).
6. The saved program counter points just after the syscall
instruction, so the signal handler won't act on cancellation.
This is similar to 4. since the program counter is past the syscall
instruction.
So The proposed fixes are:
1. Remove the enable_asynccancel/disable_asynccancel function usage in
cancellable syscall definition and instead make them call a common
symbol that will check if cancellation is enabled (__syscall_cancel
at nptl/cancellation.c), call the arch-specific cancellable
entry-point (__syscall_cancel_arch), and cancel the thread when
required.
2. Provide an arch-specific generic system call wrapper function
that contains global markers. These markers will be used in
SIGCANCEL signal handler to check if the interruption has been
called in a valid syscall and if the syscalls has side-effects.
A reference implementation sysdeps/unix/sysv/linux/syscall_cancel.c
is provided. However, the markers may not be set on correct
expected places depending on how INTERNAL_SYSCALL_NCS is
implemented by the architecture. It is expected that all
architectures add an arch-specific implementation.
3. Rewrite SIGCANCEL asynchronous handler to check for both canceling
type and if current IP from signal handler falls between the global
markers and act accordingly.
4. Adjust libc code to replace LIBC_CANCEL_ASYNC/LIBC_CANCEL_RESET to
use the appropriate cancelable syscalls.
5. Adjust 'lowlevellock-futex.h' arch-specific implementations to
provide cancelable futex calls.
Some architectures require specific support on syscall handling:
* On i386 the syscall cancel bridge needs to use the old int80
instruction because the optimized vDSO symbol the resulting PC value
for an interrupted syscall points to an address outside the expected
markers in __syscall_cancel_arch. It has been discussed in LKML [1]
on how kernel could help userland to accomplish it, but afaik
discussion has stalled.
Also, sysenter should not be used directly by libc since its calling
convention is set by the kernel depending of the underlying x86 chip
(check kernel commit 30bfa7b3488bfb1bb75c9f50a5fcac1832970c60).
* mips o32 is the only kABI that requires 7 argument syscall, and to
avoid add a requirement on all architectures to support it, mips
support is added with extra internal defines.
Checked on aarch64-linux-gnu, arm-linux-gnueabihf, powerpc-linux-gnu,
powerpc64-linux-gnu, powerpc64le-linux-gnu, i686-linux-gnu, and
x86_64-linux-gnu.
[1] https://lkml.org/lkml/2016/3/8/1105
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
I used these shell commands:
../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")
and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.
I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah. I don't
know why I run into these diagnostics whereas others evidently do not.
remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
Historically, SINGLE_THREAD_P is defined to 1 in the dynamic loader.
This has the side effect of disabling cancellation points. In order
to enable future use of SINGLE_THREAD_P for single-thread
optimizations in the dynamic loader (which becomes important once
more code is moved from libpthread), introduce a new
NO_SYSCALL_CANCEL_CHECKING macro which is always 1 for IS_IN (rtld),
indepdently of the actual SINGLE_THREAD_P value.
Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
I used these shell commands:
../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")
and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
With all Linux ABIs using the expected Linux kABI to indicate
syscalls errors, the INTERNAL_SYSCALL_DECL is an empty declaration
on all ports.
This patch removes the 'err' argument on INTERNAL_SYSCALL* macro
and remove the INTERNAL_SYSCALL_DECL usage.
Checked with a build against all affected ABIs.
This patch move the single-thread syscall optimization defintions from
syscall-cancel.h to new header file single-thread.h and also move the
cancellation definitions from pthreadP.h to syscall-cancel.h.
The idea is just simplify the inclusion of both syscall-cancel.h and
single-thread.h (without the requirement of including all pthreadP.h
defintions).
No semantic changes expected, checked on a build for all major ABIs.
* nptl/pthreadP.h (CANCEL_ASYNC, CANCEL_RESET, LIBC_CANCEL_ASYNC,
LIBC_CANCEL_RESET, __libc_enable_asynccancel,
__libc_disable_asynccancel, __librt_enable_asynccancel,
__libc_disable_asynccancel, __librt_enable_asynccancel,
__librt_disable_asynccancel): Move to ...
* sysdeps/unix/sysv/linux/sysdep-cancel.h: ... here.
(SINGLE_THREAD_P, RTLD_SINGLE_THREAD_P): Move to ...
* sysdeps/unix/sysv/linux/single-thread.h: ... here.
* sysdeps/generic/single-thread.h: New file.
* sysdeps/unix/sysdep.h: Include single-thread.h.
* sysdeps/unix/sysv/linux/futex-internal.h: Include sysdep-cancel.h.
* sysdeps/unix/sysv/linux/lowlevellock-futex.h: Likewise.
This patch adds the thrd_* definitions from C11 threads (ISO/IEC 9899:2011),
more specifically thrd_create, thrd_curent, rhd_detach, thrd_equal,
thrd_exit, thrd_join, thrd_sleep, thrd_yield, and required types.
Mostly of the definitions are composed based on POSIX conterparts, such as
thrd_t (using pthread_t). For thrd_* function internally direct
POSIX pthread call are used with the exceptions:
1. thrd_start uses pthread_create internal implementation, but changes
how to actually calls the start routine. This is due the difference
in signature between POSIX and C11, where former return a 'void *'
and latter 'int'.
To avoid calling convention issues due 'void *' to int cast, routines
from C11 threads are started slight different than default pthread one.
Explicit cast to expected return are used internally on pthread_create
and the result is stored back to void also with an explicit cast.
2. thrd_sleep uses nanosleep internal direct syscall to avoid clobbering
errno and to handle expected standard return codes. It is a
cancellation entrypoint to be consistent with both thrd_join and
cnd_{timed}wait.
3. thrd_yield also uses internal direct syscall to avoid errno clobbering.
Checked with a build for all major ABI (aarch64-linux-gnu, alpha-linux-gnu,
arm-linux-gnueabi, i386-linux-gnu, ia64-linux-gnu, m68k-linux-gnu,
microblaze-linux-gnu [1], mips{64}-linux-gnu, nios2-linux-gnu,
powerpc{64le}-linux-gnu, s390{x}-linux-gnu, sparc{64}-linux-gnu,
and x86_64-linux-gnu).
Also ran a full check on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu,
arm-linux-gnueabhf, and powerpc64le-linux-gnu.
[BZ #14092]
* conform/Makefile (conformtest-headers-ISO11): Add threads.h.
(linknamespace-libs-ISO11): Add libpthread.a.
* conform/data/threads.h-data: New file: add C11 thrd_* types and
functions.
* include/stdc-predef.h (__STDC_NO_THREADS__): Remove definition.
* nptl/Makefile (headers): Add threads.h.
(libpthread-routines): Add new C11 thread thrd_create, thrd_current,
thrd_detach, thrd_equal, thrd_exit, thrd_join, thrd_sleep, and
thrd_yield.
* nptl/Versions (libpthread) [GLIBC_2.28]): Add new C11 thread
thrd_create, thrd_current, thrd_detach, thrd_equal, thrd_exit,
thrd_join, thrd_sleep, and thrd_yield symbols.
* nptl/descr.h (struct pthread): Add c11 field.
* nptl/pthreadP.h (ATTR_C11_THREAD): New define.
* nptl/pthread_create.c (START_THREAD_DEFN): Call C11 thread start
routine with expected function prototype.
(__pthread_create_2_1): Add C11 threads check based on attribute
value.
* sysdeps/unix/sysdep.h (INTERNAL_SYSCALL_CANCEL): New macro.
* nptl/thrd_create.c: New file.
* nptl/thrd_current.c: Likewise.
* nptl/thrd_detach.c: Likewise.
* nptl/thrd_equal.c: Likewise.
* nptl/thrd_exit.c: Likewise.
* nptl/thrd_join.c: Likewise.
* nptl/thrd_priv.h: Likewise.
* nptl/thrd_sleep.c: Likewise.
* nptl/thrd_yield.c: Likewise.
* include/threads.h: Likewise.
This patch adds two new macros for internal and inline syscall to use
within GLIBC: INTERNAL_SYSCALL_CALL and INLINE_SYSCALL_CALL. They are
similar to the old INTERNAL_SYSCALL and INLINE_SYSCALL with the difference
the new macros accept a variable argument call and do not require to pass
the expected argument size.
The advantage is it is possible to use variable argument macros like
SYSCALL_LL{64} without the need to also handle the argument size. So
for an ABI where SYSCALL_LL might split the argument in high and low
parts, instead of:
INTERNAL_SYSCALL_DECL (err);
#if ...
INTERNAL_SYSCALL (syscall, err, 2, SYSCALL_LL (len));
#else
INTERNAL_SYSCALL (syscall, err, 1, SYSCALL_LL (len));
#endif
It will be just:
INTERNAL_SYSCALL_CALL (syscall, err, SYSCALL_LL (len));
The INLINE_SYSCALL_CALL follows the same semanthic regarding the argument
and is similar to INLINE_SYSCALL regarding setting errno.
Checked with a build for x86_64, i386, aach64, armhf, powerpc64le, powerpc32,
and mips32. No code generation changed.
* sysdeps/unix/sysdep.h (__INTERNAL_SYSCALL0): New macro.
(__INTERNAL_SYSCALL1): Likewise.
(__INTERNAL_SYSCALL2): Likewise.
(__INTERNAL_SYSCALL3): Likewise.
(__INTERNAL_SYSCALL4): Likewise.
(__INTERNAL_SYSCALL5): Likewise.
(__INTERNAL_SYSCALL6): Likewise.
(__INTERNAL_SYSCALL7): Likewise.
(__INTERNAL_SYSCALL_NARGS_X): Likewise.
(__INTERNAL_SYSCALL_NARGS): Likewise.
(__INTERNAL_SYSCALL_DISP): Likewise.
(INTERNAL_SYSCALL_CALL): Likewise.
(__SYSCALL0): Rename to __INLINE_SYSCALL0.
(__SYSCALL1): Rename to __INLINE_SYSCALL1.
(__SYSCALL2): Rename to __INLINE_SYSCALL2.
(__SYSCALL3): Rename to __INLINE_SYSCALL3.
(__SYSCALL4): Rename to __INLINE_SYSCALL4.
(__SYSCALL5): Rename to __INLINE_SYSCALL5.
(__SYSCALL6): Rename to __INLINE_SYSCALL6.
(__SYSCALL7): Rename to __INLINE_SYSCALL7.
(__SYSCALL_NARGS_X): Rename to __INLINE_SYSCALL_NARGS_X.
(__SYSCALL_NARGS): Rename to __INLINE_SYSCALL_NARGS.
(__SYSCALL_DISP): Rename to __INLINE_SYSCALL_DISP.
(__SYSCALL_CALL): Rename to INLINE_SYSCALL_CALL.
(SYSCALL_CANCEL): Replace __SYSCALL_CALL with INLINE_SYSCALL_CALL.
This patch fixes the SYSCALL_CANCEL macro for usage with zero argument
number (for instance SYSCALL_CANCEL (pause)) using a similar approach
used for SOCKETCALL_CANCEL.
GLIBC build still does not hit this issue still since SYSCALL_CANCEL
is not currently being used for zero arguments calls.
Tested on i386, x86_64, powerpc64le, aarch64.
* sysdeps/unix/sysdep.h (SYSCALL_CANCEL): Fix macro for zero argument
syscalls.
(__SYSCALL0): New macro.
(__SYSCALL1): Likewise.
(__SYSCALL2): Likewise.
(__SYSCALL3): Likewise.
(__SYSCALL4): Likewise.
(__SYSCALL5): Likewise.
(__SYSCALL6): Likewise.
(__SYSCALL7): Likewise.
(__SYSCALL_CONCAT_X): Likewise.
(__SYSCALL_CONCAT): Likewise.
(__SYSCALL_DIST): Likewise.
(__SYSCALL_CALL): Likewise.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
* sysdeps/generic/memcmp.c: Add prototype decls for internal fns.
* locale/programs/locale.c: Include string.h.
* sunrpc/xdr_stdio.c (xdrstdio_getlong), sunrpc/xdr_rec.c
(xdrrec_getlong), sunrpc/xdr_mem.c (xdrmem_getlong): Make sure
appropriate sign-extension is performed on machines with
sizeof(long) > 4.
* sunrpc/xdr.c (xdr_int, xdr_u_int): If sizeof(long)==8 and
sizeof(int)<sizeof(long), we need to go through a temporary
variable.
* locale/programs/ld-numeric.c: Include <alloca.h>
* libio/stdio.h (__libc_fatal): Add prototype.
* libio/cleanup.c: Use __P() to declare prototype when __STDC__ is
in efect.
* libio/iopopen.c (read_or_write, parent_end, child_end): Declare
volatile to avoid "might get clobbered by longjmp" warning.
* features.h (__KERNEL_STRICT_NAMES): Define __KERNEL_STRICT_NAMES
unless _LOOSE_KERNEL_NAMES is in effect (which, with high
probability is a sure loser).
* sysdeps/unix/sysv/linux/gnu/types.h (__KERNEL_STRICT_NAMES): Remove.
* sysdeps/unix/bsd/osf/alpha/start.S (errno): Removed.
* sysdeps/unix/sysv/linux/alpha/start.S: Ditto.
* misc/paths.h (_PATH_MAN): Change from /usr/share/man to /usr/man
to be Linux FSSTND compliant.
Mon Jun 10 17:50:31 1996 David Mosberger-Tang <davidm@azstarnet.com>
* sysdeps/unix/sysv/linux/alpha/pipe.S: Use PSEUDO.
* sysdeps/unix/sysv/linux/alpha/sysdep.S,
sysdeps/unix/sysv/linux/alpha/brk.S,
sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S,
sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S,
sysdeps/unix/sysv/linux/alpha/llseek.S,
sysdeps/unix/sysv/linux/alpha/sigsuspend.S,
sysdeps/unix/sysv/linux/alpha/syscall.S: Rename syscall_error to
__syscall_error to avoid intruding application name space.
* sysdeps/unix/sysv/linux/alpha/sysdep.h: Rename __NR_get?id
to SYS_get?id so that syscall stubs in sysdeps/unix define
these syscalls in terms of getxpid/getxuid/getxgid.
* sysdeps/unix/_exit.S, sysdeps/unix/getegid.S,
sysdeps/unix/geteuid.S, sysdeps/unix/getppid.S,
sysdeps/unix/execve.S, sysdeps/unix/fork.S,
sysdeps/unix/syscall.S: Terminate syscall with PSEUDO_END.
* sysdeps/unix/make-syscalls.sh, sysdeps/unix/sysdep.h
(PSEUDO_END): Rename END() to PSEUDO_END().
* sysdeps/unix/alpha/sysdep.h: Move error-handling code in PSEUDO
to PSEUDO_END to improve branch-prediction. Include .frame
directive to make syscalls debugabble.
(PSEUDO_END): New macro.
* sysdeps/unix/alpha/sysdep.h, sysdeps/alpha/bb_init_func.S,
sysdeps/unix/sysv/linux/alpha/brk.S: Use ldiq instead of ldi since
latter is illegal under DEC Unix.
* sysdeps/unix/alpha/sysdep.S: Renamed from
sysdeps/unix/sysv/linux/alpha/sysdep.S. This file works for OSF/1
as well.
* sysdeps/unix/bsd/osf/alpha/sysdep.S: Remove (note that the
EWOULDBLOCK -> EAGAIN mapping was unnecessary since
EWOULDBLOCK==EAGAIN under DEC Unix and Linux/Alpha).
* sysdeps/alpha/divrem.h: Use retaddr instead of ra as the return
address register in the .frame directive.
* sysdeps/alpha/copysign.c: Remove.
* sunrpc/rpc/types.h: Include <sys/param.h> and <netinet/in.h> to
avoid RPC definitions of INADDR_LOOPBACK and/or MAXHOSTNAMELEN.
* errno.h: Move __END_DECLS to correct place to make file
compilable under c++.
* dirent/dirent.h: Document _DIRENT_HAVE_D_OFF macro. Define
d_ino only if <direntry.h> hasn't defined d_fileno.
* configure.in (HAVE_ASM_WEAKEXT_DIRECTIVE): Reverse order of
arguments to weakext to make .weakext detection work on ECOFF systems.
* FAQ: Add Linux/Alpha to list of supported platforms. Mention
that _validuser() has been replaced by __ivaliduser().
Thu Jun 6 21:39:38 1996 David Mosberger-Tang <davidm@azstarnet.com>
* sysdeps/unix/bsd/sun/sunos4/tcsetattr.c (tcsetattr): Declare cmd
as unsigned long, not as int (to avoid incorrect int->long
promotion).
* time/Makefile (tests): Add test-tz.
* time/test-tz.c: New test.
* time/clocktest.c: Rewrite to test more meaningfully.
* sysdeps/unix/sysv/linux/syscalls.list: Add bdflush,
create_module, delete_module, get_kernel_syms, init_module,
klogctl.
* sysdeps/unix/sysv/linux/sys/param.h (MAXSYMLINKS): Define as 5
instead of SYMLOOP_MAX, which is nowhere to be found.
* sysdeps/unix/sysv/linux/sys/msq_buf.h,
sysdeps/unix/sysv/linux/sys/sem_buf.h,
sysdeps/unix/sysv/linux/sys/shm_buf.h [__USE_MISC]: Add more
control ops and datastructures.
* sysdeps/unix/sysv/linux/sys/io.h: New file declaring low-level
I/O related functions.
* sysdeps/unix/sysv/linux/sys/kdaemon.h: New file declaring kernel
daemon related functions/operations.
* sysdeps/unix/sysv/linux/sys/klog.h: New file declaring kernel
logging related functions/operations.
* sysdeps/unix/sysv/linux/sys/module.h: New file declaring kernel
module related functions/operations.
* sysdeps/unix/sysv/linux/speed.c: Only do "mention this twice" hack
for non-Alpha based Linux systems.
* sysdeps/unix/sysv/linux/alpha/speed.c: Remove.
* sysdeps/unix/sysv/linux/Makefile (headers): Add sys/module.h,
sys/io.h, sys/klog.h, and sys/kdaemon.h.
* sysdeps/unix/sysdep.h (END): Define empty END macro for
platforms that don't need some sort of end directive at the
end of functions.
* sysdeps/unix/make-syscalls.sh: Emit END($strong) at end of
syscall wrapper to allow correct generation of debugging
information.
* sysdeps/unix/alpha/sysdep.h (END): Redefine to use .end
directive for both ELF and ECOFF.
(ret): Delete macro. It was a dangerous macro and unnecessary
since the Alpha assemblers recognizes "ret" as a macro themselves.
* sysdeps/gnu/utmpbits.h (struct utmp): Move ut_tv behind
ut_session to guarantee long alignment. This is important for
Linux/Alpha since ut_tv.tv_sec is 32 bits and time_t is 64 bits.
This will all get cleaned up as programs start to use ut_tv
instead ut_time.
* sysdeps/alpha/divrem.h: Include <sysdep.h> instead of <*/regdef.h>.
* sysdeps/alpha/bsd-_setjmp.S (setjmp): Renamed entry point to
_setjmp.
* sysdeps/alpha/_mcount.S, sysdeps/alpha/bb_init_func.S,
sysdeps/alpha/bsd-_setjmp.S, sysdeps/alpha/bsd-setjmp.S,
sysdeps/alpha/copysign.S, sysdeps/alpha/divrem.h,
sysdeps/alpha/fabs.S, sysdeps/alpha/ffs.S, sysdeps/alpha/htonl.S,
sysdeps/alpha/htons.S, sysdeps/alpha/memchr.S,
sysdeps/alpha/setjmp.S, sysdeps/alpha/strlen.S,
sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S,
sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S,
sysdeps/unix/sysv/linux/alpha/llseek.S,
sysdeps/unix/sysv/linux/alpha/pipe.S,
sysdeps/unix/sysv/linux/alpha/sigsuspend.S,
sysdeps/unix/sysv/linux/alpha/sysdep.S: Use END macro instead of
.end directive.
* csu/initfini.c (_fini): Tell gcc that _fini is not a leaf
function by having it contain a dummy function call.
* configure.in (config_machine): Don't make ELF the default for
Linux/Alpha just yet (use --with-elf instead).
(.init/.fini check): Generate .text to ensure function start and
end are in same section.
* sysdeps/unix/bsd/osf/alpha/brk.S,
sysdeps/unix/sysv/linux/alpha/brk.S (__curbrk): Store the entire
break value, not just the low 32 bits to accomodate large
memories.
Tue May 28 10:46:04 1996 Richard Henderson <rth@tamu.edu>
* sysdeps/unix/sysv/linux/alpha/brk.S: Rather than attempt to
dynamically resolve _end for initializing __curbrk, support the
brk(0) query idiom.
* sysdeps/alpha/bb_init_func.S: Don't make `init' an external symbol.
* sysdeps/alpha/bsd-_setjmp.S: The function is _setjmp not setjmp.
Sun May 26 22:17:38 1996 Richard Henderson <rth@tamu.edu>
* stdlib/lcong48_r.c, stdlib/seed48_r.c, stdlib/strtod.c,
stdlib/strtol.c: Include <string.h> for mem* and str* fns used.
Thu May 23 02:15:56 1996 David Mosberger-Tang <davidm@azstarnet.com>
* sysdeps/unix/sysv/linux/Makefile (headers): Add sys/io.h,
sys/klog.h, and sys/kdaemon.h.
* sysdeps/unix/sysv/linux/sys/io.h: New file.
* sysdeps/unix/sysv/linux/sys/klog.h: Ditto.
* sysdeps/unix/sysv/linux/sys/kdaemon.h: Ditto.
* sysdeps/unix/alpha/sysdep.h (ret): Remove macro. It is
dangerous and unnecessary since both OSF/1 as and gas define "ret"
as a pseudo-instruction.
Sat Jun 1 17:18:21 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* time/tzset.c (__tzset): Clear tz_rules name pointers after freeing
them. Bug found by David Mosberger-Tang.
* sysdeps/posix/tempname.c (__stdio_gen_tempname): Use __ptr_t instead
of PTR.
* extra-lib.mk (extra-objs): Use patsubst intead of $(A:=B) syntax
to work around Make bug when A contains var ref.
Fri May 31 18:27:52 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* string/string.h [__USE_MISC]: Declare basename; OSF/1 puts it here.
* sysdeps/unix/sysv/linux/syscalls.list (getpgid, setpgid): Define __
strong names and [gs]etpgid as weak aliases.
* math/math_private.h (GET_LDOUBLE_EXP): Add missing backslash.
